ABSTRACT
Chromosomal behaviour during megasporogenesis and microsporogenesis has been studied in ornamental Delphinium ajacis L. Meiosis in female sex cell initiates later than male. The floral buds which carry egg mother cell (EMC) at diplotene stage has pollen mother cells (PMCs) at tetrad stage of meiosis suggesting protandry. Although the 16 chromosomes formed regular eight bivalents in both the sex cells, they differed in overall chiasma frequency which was 32.95% higher in EMCs and found to be 18.52 ± 2.12 per cell. In PMCs, the average chiasma frequency recorded was 13.93 ± 1.40 per cell. Interestingly, this variation in chiasma frequency was largely confined to the two large bivalents which shared 42.61% chiasma per EMC. The use of Q–Q plot, Box plot and Whisker plot showed departure in the chiasma frequency distributions in EMCs and PMCs from the normal distribution pattern. The difference in chiasma frequency in the two sex cells was significant at all levels as indicated by the low P values of 3.094 9 10-11 obtained from nonparametric test, i.e. Wilcoxon rank-sum test. It is suggested that the two different mechanisms of recombination are operational in the two sex cells, and the sex differences of chiasma frequency could have arisen due to differential epigenetic modifications of the chromatin which pattern the double-strand breaks, and the position and frequency of crossing over visible as chiasmata.
ABSTRACT
The present study is undertaken to evaluate the different clinical presentations of thyroid lesions in Northern Indian population. Clinical examination, although very accurate in most cases of thyroid lesion, is inadequate in some areas especially, in staging of thyroid malignancies and in detecting the multi-nodularity of the gland. Methods: The study was conducted in the postgraduate department of pathology of a teaching hospital for a period of 1 year. It was a prospective hospital based Study. In each case, a brief clinical history and physical examination along with evaluation of relevant investigation was carried out. Patient was explained about whole of the procedure & the consent for the procedure was taken in all patients. FNAC of thyroid gland was done and the results of FNAC were correlated with histopathology, wherever available. The final results were correlated with different clinical presentations using SPSS 11.5 software. Results: Out of the 139 patients, 134 presented with swelling in the neck, 3 patients presented with pain in the neck while as 2 patients came with discomfort in the neck. 74 patients have duration of swelling more than 2 years, 51 patients have duration upto 1 year, 10 patients have duration between 1 to 2 years and 4 patients have less than one month. Out of 139 patients, 110 patients have solitary swelling, 87 have swelling on right side, 119 presented with regular margins, 91 presented with firm consistency, 130 were mobile and 135 presented with non-tender. Conclusion: Majority of the patients presented after 2 years of illness i.e. 74. Only 4 patients presently acutely within 1 month of illness. The major complaint was swelling in neck i.e. in 134, rest presented with local pain and discomfort.